Ambrose of Milan — as excerpted in the Catena Aurea on Luke 5:12-16

“And that the Priest also should know that not by the order of the law, but by the grace of God above the law, he was cured. And since a sacrifice is commanded by the regulation of Moses, the Lord shews that He does not abrogate the law, but fulfil it. As it follows, And offer for thy cleansing according as Moses commanded.”